feat(pwa): ♻️ use strategies from FetchStrategy instead of inline code

src/serviceworker/mod.ts

@@ -1,9 +1,10 @@
 /// <reference no-default-lib="true"/>
 /// <reference lib="webworker" />
 
+import type { JsonValue } from '$std/json/common.ts'
 import { ApiPayload } from ':src/utils.ts'
 import type { PrecacheResponse } from '../../routes/api/serviceworker/precache.tsx'
-import type { JsonValue } from '$std/json/common.ts'
+import { FetchStrategy } from './src/fetch_strategy.ts'
 
 // Force load service worker types
 const self = globalThis as unknown as ServiceWorkerGlobalScope
@@ -126,39 +127,32 @@ async function fetchHandler(event: FetchEvent) {
 		updatePreCache()
 
 		// TODO handle search params
-		const cached = await preCache.match(event.request) ??
-			await fetch(event.request).then((response) =>
-				response.ok ? response : null
-			).catch(() => null) ??
-			await preCache.match(event.request, { ignoreSearch: true })
+		const ac = new AbortController()
 
-		if (cached === undefined) {
-			throw new Error(`no cache available for pre-cached-url "${url}"`)
+		const preCachedNoSearch = preCache
+			.match(event.request, { ignoreSearch: true })
+			.then((response) => {
+				if (response) {
+					ac.abort()
+					return response
 				}
-		return cached
+				throw new Error(`no cache available for pre-cached-url "${url}"`)
+			})
+
+		return Promise.race([
+			FetchStrategy.fastestAndCacheRefresh(preCache, event, ac),
+			preCachedNoSearch,
+		])
 	}
 
 	// Fastest and cache refresh
 	if (url.origin === location.origin && method === 'GET') {
 		const cache = await getDynCache()
-
-		// Get cache or throw
-		const cachedOrError = cache.match(event.request).then((response) => {
-			if (response) return response
-			throw new Error(`no cache available for "${url}"`)
-		})
-		// Fetch and cache
-		const fetchedAndCached = fetch(event.request).then((response) => {
-			cache.put(event.request, response.clone())
-			return response
-		})
-
-		// Get fastest
-		return Promise.race([cachedOrError, fetchedAndCached])
+		FetchStrategy.fastestAndCacheRefresh(cache, event)
 	}
 
 	// Network only
-	return fetch(event.request)
+	return FetchStrategy.networkOnly(event)
 }
 
 async function getDynCache(): Promise<Cache> {